that depends on what you decide to use ,non ped or ped ,both are bred for speed but the non peds are faster the choice is yours .there are alot of good racing studs out there .if you pm me i can give you a contact top non ped racing champion mansfield way.
.....how can you say the non ped whippets are faster ? .......ive had both ped and non ped also work along side both . you get good ones from both and bad ones from both but non ped usually have grey in them a few generations back to keep the size up . ive had a 17 inch bitch that was fast as feck and takle anything full ped and faster